Malicious PDF — malware analysis report

Static analysis result for SHA-256 e92df8effdc1905a…

MALICIOUS

PDF

84.5 KB Created: 2021-08-23 13:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6cbfe85d5f989307fd7210215b6f01fc SHA-1: bbbbef9eef83440730f677c2c3df644135c19fab SHA-256: e92df8effdc1905a0e2486b9fa6635758a2e26195abad297ccfc5e88c606aee9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that lead to external sites, some of which are hosted on compromised WordPress upload directories. This suggests a phishing or malware distribution campaign leveraging these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://archism.ru/uplcv?utm_term=how+many+calories+in+a+glass+of+moscato+white+wine PDF link annotation
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/ac8bb2434a7aac4e35ba3e3e1f82046b/82767640223.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/zomosiwupixi.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/uuagbuqefs9jg3qm53puhlrco8/2505046310.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/fofipaperetasawoxulipe.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/29464117571.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/pomafasov.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d16daaf1b---borogevolebet.pdfIn PDF document text
    • http://chpcentre.com/files/file/gukeraxepekuj.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/26105636037.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/99755824519.pdfIn PDF document text
    • http://upperdublin1970.com/clients/3/3b/3b2fb281f4756d03d37a29c41a8c1d95/File/41100847058.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd41f7cbda---23776176325.pdfIn PDF document text
    • http://blsfamilyreunion.com/clients/1/11/11e20eb1c47c3498ff3e66fc1941d138/File/ligusej.pdfIn PDF document text
    • http://moje-stranky.eu/userfiles/file/89069006596.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e22954e9de3---dubirarig.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/zafebabig.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/60304748024.pdfIn PDF document text
    • https://aduanaldelvalle.mx/userfiles/file/11867376376.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c6db3f6e0---80466101418.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/99e9ef93f518fcdf132611528ef9c5fa/kulofuzaxereboxet.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/91218700451.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/64056817771.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/dien4n1tc4hq3fetarhi1ulsgt/18001980292.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19fd741b4e---fitukepuguralamoxajewup.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/a4264798a2de3051738f673a0c735b43/xevabun.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/fapidirexiturodirora.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE606 16824 bytes
SHA-256: 9ae3fa641f0fdf1dd2c97cd28ea7eb6d4ee84b4f03586e9c8fa222949ee5a5a3
font_01_sfnt_off0001119d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B4 10972 bytes
SHA-256: a564d400beab55b02741ecf22ba83c71b6007995bcce71be930032aee3b37bc1

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